GB1388688A - Control circuits for dc series electric motors - Google Patents

Control circuits for dc series electric motors

Info

Publication number
GB1388688A
GB1388688A GB1434071A GB1434071A GB1388688A GB 1388688 A GB1388688 A GB 1388688A GB 1434071 A GB1434071 A GB 1434071A GB 1434071 A GB1434071 A GB 1434071A GB 1388688 A GB1388688 A GB 1388688A
Authority
GB
United Kingdom
Prior art keywords
current
capacitor
armature
diode
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1434071A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cableform Ltd
Original Assignee
Cableform Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cableform Ltd filed Critical Cableform Ltd
Priority to GB1434071A priority Critical patent/GB1388688A/en
Priority to US00246547A priority patent/US3811080A/en
Priority to IT50070/72A priority patent/IT957730B/en
Priority to SE7205917A priority patent/SE386784B/en
Priority to DE19722223044 priority patent/DE2223044A1/en
Priority to FR7216818A priority patent/FR2139429A5/fr
Publication of GB1388688A publication Critical patent/GB1388688A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor
    • H02P3/10—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor by reversal of supply connections

Abstract

1388688 Control of D.C. motors CABLEFORM Ltd 20 April 1972 [11 May 1971] 14340/71 Heading H2J A control circuit for the D.C. series motor A, F of a battery-operated vehicle comprises a conventional thyristor switching arrangement S to cause the motor to be supplied with pulses of current of variable frequency and/or markspace ratio as determined by a control signal from a pulse generator (not shown) connected to the arrangement S via transistor T3 and resistor R1, and means to change the control of arrangement S during braking conditions to restrict the range of current which can be applied to the motor and hence prevent the field current from exceeding a predetermined value. This control feature is provided by a circuit comprising transistors T1, T2, diode D3, resistor R2, capacitor Cl and Zener diode ZD1, the capacitor Cl being charged by each gate signal from the pulse generator and discharged by transistor T2 when it and the transistor T1 become conductive due to the armature diode D1 becoming reversebiased when the field and armature currents equalize. During motoring conditions, the circulating current in the armature-diode circuit A, D1 is zero or very low by the end of the interpulse period. Hence when the switch S is turned on, the field current rises to equal the armature current in a very short time so that capacitor Cl acquires very little charge. During braking conditions, when the field winding connections are reversed and a high generated current flows in the armature-diode circuit A, D1 during the inter-pulse period, the capacitor C1 continues to charge as the field current rises towards the armature current and, when it reaches a predetermined value, the capacitor voltage causes the Zener diode ZD1 to conduct to apply a signal to a high rate clamp in the pulse generator, whereby the switch S is controlled to restrict the range of current that may be applied to the motor, for example, by restricting the maximum frequency of the current pulses. Typical voltage and current waveforms during motoring and generating conditions are discussed, Fig. 2 (not shown), and mention is made of adjustment of the value of resistor R2 and/or capacitor C1 to select a desired threshold above which the range of current supplied is restricted.
GB1434071A 1971-05-11 1971-05-11 Control circuits for dc series electric motors Expired GB1388688A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB1434071A GB1388688A (en) 1971-05-11 1971-05-11 Control circuits for dc series electric motors
US00246547A US3811080A (en) 1971-05-11 1972-04-24 Control circuits for d.c. electric motors
IT50070/72A IT957730B (en) 1971-05-11 1972-05-05 IMPROVEMENT IN CONTROL CIRCUITS FOR DIRECT CURRENT ELECTRIC MOTORS
SE7205917A SE386784B (en) 1971-05-11 1972-05-05 CONTROL CIRCUIT FOR CONTROL OF A SERIAL DIRECTION ENGINE
DE19722223044 DE2223044A1 (en) 1971-05-11 1972-05-08 Control circuit for direct current electric motors
FR7216818A FR2139429A5 (en) 1971-05-11 1972-05-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1434071A GB1388688A (en) 1971-05-11 1971-05-11 Control circuits for dc series electric motors

Publications (1)

Publication Number Publication Date
GB1388688A true GB1388688A (en) 1975-03-26

Family

ID=10039426

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1434071A Expired GB1388688A (en) 1971-05-11 1971-05-11 Control circuits for dc series electric motors

Country Status (6)

Country Link
US (1) US3811080A (en)
DE (1) DE2223044A1 (en)
FR (1) FR2139429A5 (en)
GB (1) GB1388688A (en)
IT (1) IT957730B (en)
SE (1) SE386784B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921745A (en) * 1973-07-23 1975-11-25 Mcculloch Corp Electric bicycle
US4054821A (en) * 1974-08-30 1977-10-18 General Electric Company D-C motor drive system with field current flow reversal upon transition between motoring and retarding modes
JPS52147719A (en) * 1976-06-02 1977-12-08 Nippon Denso Co Ltd Inversion damping detector in electric car controllers
US4370603A (en) * 1980-10-23 1983-01-25 Westinghouse Electric Corp. Shunt field control apparatus and method
US4464546A (en) * 1981-11-23 1984-08-07 Westinghouse Electric Corp. Power collection apparatus for a vehicle
US5565760A (en) * 1994-11-02 1996-10-15 General Electric Company Electrical propulsion systems for a golf car
USRE36454E (en) * 1994-11-02 1999-12-21 General Electric Company Electrical propulsion systems for a vehicle
US5705903A (en) * 1996-02-12 1998-01-06 Unicoil, Inc. Electric brake for an alternating current motor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1438016B2 (en) * 1962-11-02 1970-11-05 Licentia Patent-Verwaltungs-GmbH, 6OOO Frankfurt Arrangement for feeding a direct current series motor
GB1015006A (en) * 1963-11-22 1965-12-31 Sevcon Eng Ltd Improvements in or relating to control means for electric motors
GB1083982A (en) * 1965-01-26 1967-09-20 Westinghouse Brake & Signal Improvements relating to electric motor control circuits
FR1479788A (en) * 1966-05-12 1967-05-05 Cableform Ltd Improvements to control devices for direct current electric motors
FR2040913A5 (en) * 1969-04-14 1971-01-22 Alsthom
GB1279838A (en) * 1969-10-28 1972-06-28 Cableform Ltd Improvements in or relating to control circuits for d.c. electric motors
US3697845A (en) * 1970-09-29 1972-10-10 Alsthom Cgee Circuit for a direct current electric motor which is controlled by thyristors both while running and while being braked

Also Published As

Publication number Publication date
DE2223044A1 (en) 1972-11-23
SE386784B (en) 1976-08-16
US3811080A (en) 1974-05-14
FR2139429A5 (en) 1973-01-05
IT957730B (en) 1973-10-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee